40 Under 40

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Welcome to Fortune’s 2018 40 Under 40, our annual ranking of the most influential young people in business. Read on to meet these disruptors, innovators, rebels and artists—and prepare to be inspired.
Click here to read The Ledger 40 Under 40 list.

Rana el Kaliouby, 39

Cofounder and CEO, Affectiva

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Courtesy of Affectiva

El Kaliouby is training machines to master the fuzzy realm of human feelings. The Egyptian-American entrepreneur cofounded Affectiva, a venture-backed “Emotion A.I.” startup, as a research scientist at MIT in 2009. Since then, the firm has analyzed 6.8 million faces—the better for decoding how to tell a smile from a smirk—and signed up 25% of the world’s biggest companies as users. Marketers, eager to test ads and products, have pounced on the mind-reading technology, though it’s also being applied to more virtuous use cases, like assisting individuals with autism and diagnosing depression.